This project demonstrates how to build a basic Richt Text Editor for React Native from scartch.
The only dependency it has is a WebView.
In order to run the demo just execute cd ./demo and from there start react-native run-android or react-native run-ios.
To see the usage of the editor just open App.tsx file.
Check description here if you're interested in details.
I hope it helps on your way of building something amazing.